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(3x+9) (7x+5)

21x^2 + 78x + 45

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Answered by Caitlin A. • Maths tutor

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Jo wants to work out the solutions of x^2 + 3x – 5 = 0 She says, ‘‘The solutions cannot be worked out because x^2 + 3x – 5 does not factorise to (x + a)(x + b) where a and b are integers.’’ Is Jo correct?

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